See, we told you this girl was dealing with more than just an eating disorder and “anxiety” issues. In an upcoming interview Demi comes clean about her yayo and alcohol problems and boy, did she hit some lows while getting high!

Demi Lovato is speaking out about her past drug use in a very candid new interview with Access Hollywood’s Kit Hoover.

The 21-year-old star, who wrote her memoir “Staying Strong: 365 Days a Year,” opened up to Kit from the set of “The X Factor” on Monday.

“I’m very, very good at manipulating people and that was something that I did in my disease, I would manipulate everyone around me. There were times I would just continue to lie, so that everything looked OK on the outside,” she told Kit.

In fact, Demi said she went to great lengths when it came to ensuring she could use drugs wherever she was.

“Something I’ve never talked about before, but with my drug use I could hide it to where I would sneak drugs. I couldn’t go without 30 minutes to an hour without cocaine and I would bring it on airplanes,” she revealed. “I would smuggle it basically and just wait until everyone in first class would go to sleep and I would do it right there. I’d sneak to the bathroom and I’d do it. That’s how difficult it got and that was even with somebody [with me], I had a sober companion, somebody who was watching me 24/7 and living with me [and] I was able to hide it from them as well.”

Demi’s rock bottom – at just 19 years old – was found at the bottom of a soda bottle.

“I was going to the airport and I had a Sprite bottle just filled with vodka and it was just nine in the morning and I was throwing up in the car and this was just to get on a plane to go back to LA to the sober living house that I was staying at…I had all the help in the world, but I didn’t want it,” she said looking back. “When I hit that moment I was like, it’s no longer fun when you’re doing it alone. I’ve really never talked about this stuff before… I don’t know if I should be sharing this.

“I think at 19 years old, I had a moment where I was like, ‘Oh my God… that is alcoholic behavior. [It’s] no longer, I’m young and rebellious and out having fun, it was, wow, I’m one of those people…I gotta get my s*** together,’” she explained.

Demi’s mom, Dianna, also sat down with Kit for the interview, where she recounted dealing with her daughter’s addiction battles.

“I suspected [she was using drugs]. It’s like any other parent, when you see things, when you see signs you don’t want to believe that’s what actually going on. So when they’re telling you that’s not what is going on… you want too badly to believe them and I think for a long time I was in denial,” she told Kit.

“I didn’t know. I didn’t actually see her, so when she said, ‘Oh no, There’s nothing going on. I’m not using, I’m not drinking, I wasn’t doing any of these things,’ Why was I not to believe her?” Dianna continued.

SMH. It turns out that Demi’s mom was part of the problem as well as she struggled with her own eating disorder and mental issues. She also sought treatment and the two of them discuss that as well. Peep a trailer from the interview below: